Grinding device



.June 14, 1932. W, FLOSS 1,863,042

. GRINDING DEVICE Filed Jan. 25, 1928 fjZ attenua? 5 Patented June 14,1932 'HPATENr OFFICE CARL W. FLOSS, OF DETROIT, MICHGAN Gamme DEVICEApplication filed January 23, 1928. 'Serial No. 248,782.

This invention relates to lapping or grinding devices more particularly'adapted. for finishing or grinding cylindrical or substantiallycylindrical apertures and has as its objects to simplify, render moreeicient and improve generally devices of this character.

Another object of this invention is to provide a device of the characterdescribed in which the control means for the abrasive members has nopositive or fixed connection with the abrasive members but is free tomove axially of the device within certain l limits whereby Athe stonesmay float and adjust themselves to lit a tapered wall or to compensatefor -uneven wear upon the stones while maintaining a uniform pressurethroughout the length of the abrading members.

Still'anotherrobject of this invention is to provide a grinding orlapping device in which the driving means therefor is connected theretoat substantially the longitudinal center of the device and in such amanner as to permit of a universal movement between the parts. Manyadvantages are obtained from a construction of this character, not theleast of which is the advantage that such a construction eliminates thepossibility of any irregular side thrusts being imparted tothe devicethus tending to produce a straight hole 'with parallel sides.

Many other objects, advantages and novel details of construction of thisinvention will be made more apparent as this description proceeds,especially when considered in conf' Referring now particularly to thedrawing wherein like reference characters indicate like parts it will benoted that the ldeviceconslsts essentially of a body or head indicatedgenerally by the reference character 10, this body being formed with aplu- 56 rality of longitudinally extending circumferentially spacedslots or recesses 11 extending radially of the body '10 and opening intothe outer surface thereof.

Located in each recess 11 is a stone holder 60 12 carrying a grindingstone or abrasive-ele' ment 13. The depth of each recess 11 is soselected with reference to the corresponding stone holder 12 that theabrasive elements are lcapable of radial movement when adjusted 03 bymechanism yet to be referred to. A shouldered portion 14 of each stoneholder engages a correspondingly shaped portion 15 of the body v10 so asto provide a positive driving connection between the body and 7 eachstone holder. The thrust on the abrasive elements in a axial directionof the device is taken up by means ofpins 16 passed transversely throughthe stone holders and engaging the end faces of the body 10.

The back of each stone holder at the longitudinal center thereof isformed with a surface 17 substantially parallel with Ithe axis of thedevice while the back or rear surface of each stone holder adjacent theends there- 5 of is provided with a vtapered or inclined surface 18.Engaging these inclined or tapered surfaces 18l are upper and loweradjusting members 19 and 20 provided with semi-spherical or curvedsurfaces 21. The upper adjusting member 19r is slidably mounted upon anarbo;l or sleeve 22 and the lower adjusting member 20 is rigidly securedto the lower ends of rods or struts 23 which pass freely throughpassages 24. The upper ends of the rods 23 are rigidly secured to thelower end of sleeve 22 as for instance by being threadedl into a flange25 Icarried by the saidf sleeve. The sleeve 22is exteriorly threadedfor'engagement by an adjusting nut, 26 which actuates the upper adjusting member 19 through the intermediary. of a spacer sleeve 27. Byreason of this construction it will be apparent that the adjustingmembers 19 and 20 may be moved relative to one another and by reason oftheir engagement with the inclined or tapering surfaces 18 of the stoneholders the stone holders will have imparted thereto a radial adjustmentcorresponding to the extent of relative movement of the 'members 19 and20.

In this connection it should be noted that the adjusting members 19 and2O provide a positive backing or support for the stone holders to limitthe inwardradial movement thereof so that these stone 'holders may beaccurately adjusted to the desired diameter. Furthermore the adjustingmembers 19 and 20 and the supporting means therefor are all free to moveaxially of the device relative to the stone holders l2 or the body l()of the device whereby the abrasive elements can readily adjustthemselves to fit a tapered wall and may also adjust themselves tocompensate for uneven stone wear The drive shaft 28 which may beconnected in any desired manner toany suitable source of power extendsloosely through an enlarged bore 29 in sleeve 22 and into an enlargedbore 30 f formed centrally ofthe body 10 The drive shaft 28 is -providedat its lower end with a semi-spherical portion 31 formed with atransversely extending hole or aperture 32.

`A drive pin 33 extends through aperture 32 and fits tightly in recessesor apertures 34 formed in the body 10. AThe aperture 32 tapers from apoint coincident with the center of drive shaft 28A outwardly towaid theends thereof thus providing clearance between the drive shaft and pin 33to permit of a relative rocking movement between the drive shaft 28 andbody 10. It will also be apparent that the drive shaft 28 may rock aboutpin 33 at right angles to its other movement just described so that ineffect drive shaft 28 is universally connected to body 10 so ythat theadvantages of such a connection as hereinbefore pointed out may berealized.

While any desired meansof normally urging and holding the stone holdersin engagein many of the essential and all of the non essential detailsof construction may be resorted to without departing from the spirit andsco e of this invention and to this end reservation is made to make suchchanges as rality of'abrasive members, a Abody upon asesoria which saidmembers are mounted for radial movement located substantially centrallyof f said members, adjustin'gfelements for said abrasive members spacedrespectively from the ends of said body and supported independentlythereof and a driving shaft extending through one of said elements anddriving shaft extending freely through said j bores and drivinglyconnected to said body within the bore thereof. v

3. In a device of the character described, a body provided with aplurality ofradially extending recesses,abrasive members mount? ed insaid recesses and movable radially relative to said body and lateralprojections carried by said abrasive members and abutting the ends ofsaid body for takingup axial thrusts imparted to said abrasive members.4. In a lapping device, a body, a plurality of abrasive elements carriedby said body and capable of radial movement relative thereto, adjustingmembers engaging said abrasive elements and spaced respectively from theends of said body, means extending freely through said body connectingsaid adjust; ing members for movement axially as a unit relative to saidabrasive members and means for relatively moving said adjusting membersfor radially adjusting said abrasive elements.` l

5. In a device of the class described, a body, a plurality of stoneholders carried by saidfbody and movable radially relative thereto,Ysaid stone holders being provided with inclined surfaces, adjustingmembers engaging said inclined surfaces, a sleeve upon which one of saidadjusting members is slidablyI mounted, means extending through saidbody connecting the other adjusting mem'- ber to said sleeve, a memberadjustably threaded upon said sleeve for relatively moving saidadjusting members and a drive shaft extending freely through said sleeveand into )said body and universally connected thereto. 6. In a device ofthe class described, a body, a plurality of stone holders carried by thebody and movable radially relative thereto, said stone holders providedwith inclined faces extending beyond opposite ends of the body,adjustable members spaced from the ends of said body and engageable withthe inclined faces, and means for actuating said adjusting members.' i

7. A device of the class described having in combination, a body, aplurality of stone holders carried by the body and movable i radiallyrelative thereto, adjusting members for the stone holders, a sleeve uponwhich one of the adjusting members is slidablemounted, means forconnecting the other adjusting member to the sleeve, and al memberadjustably mounted upon the sleeve and engageable with theadjustablemember thereon for ac-4 tuating the same.

8. A device of the class described having in combination, a body, aplurality of stone holders carried b the body and movable radiallyrelative tereto, adjusting members for the stone holders, a sleeve uponwhich vone of the adjusting members is slidably mounted, said sleevearranged Within the stone holders and spaced from one end of the body,means for supporting the other adjustable member in spaced relation tothe opposite end of the body including members extending through thebody and connected to the sleeve,

and means for relatively moving the adjusting members for radiallyadjusting' the stone holders.

9. In a device of 'the class described, a

body, a plurality of stone holders carried by said body and movableradially relative thereto, said stone holders being provided withinclined surfaces, adjusting members engaging said inclined surfaces, asleeve upon which one of said adjusting members is slidably mounted,means extending through said body connecting the other adjusting memberto said sleeve, and a member adj ust'ably threaded upon said sleeve forrelatively moving said adjusting members.

' 10. In a lapping device, a body, a plurality of abrasive vmemberscarried by the body and movable radially relative thereto,

adjusting elements for the abrasive members spaced axially beyond oposite ends of the body, a-A driving shaft, an a universal connectionbetween said shaft and body substantially centrally longitudinally ofthe evlce.

V In testimony whereof I affix my signature.

CARL W. FLOSS.

